为什么，从一个Activity 跳到另一个Activity 出莫名的错误？

[lxj105627]

报这样的错：The application has stoped unexpectedly.please try again!
求大虾们，指教？

[Monkey_D_Luffy]

这个可能是因为你的mainfest.xml中没有声明后面一个ACTIVITY

[hjkto]

AndroidMainfest.xml中增加类的声明

[hjkto]

给你一个例子，对着例子看看

package irdc.ex03_09; 
/* import相关class */
import android.app.Activity;
import android.os.Bundle; 
import android.view.View;
import android.widget.Button;
import android.content.Intent;
public class EX03_09 extends Activity 
{
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState)
  { 
    super.onCreate(savedInstanceState);
    /* 加载main.xml Layout */ 
    setContentView(R.layout.main);
    /* 以findViewById()取得Button对象，并加入onClickListener */
    Button b1 = (Button) findViewById(R.id.button1);
    b1.setOnClickListener(new Button.OnClickListener()
    { 
      public void onClick(View v) 
      {
        /* new一个Intent对象，并指定要启动的class */ 
        Intent intent = new Intent(); 
        intent.setClass(EX03_09.this, EX03_09_1.class); 
        /* 调用一个新的Activity */ startActivity(intent);
        /* 关闭原本的Activity */ EX03_09.this.finish();
        } 
      });
    } 
  }

package irdc.ex03_09;
/* import相关class */
import android.app.Activity; 
import android.os.Bundle;
import android.content.Intent; 
import android.view.View; 
import android.widget.Button; 
public class EX03_09_1 extends Activity 
{ 
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState); 
    /* 载入mylayout.xml Layout */ 
    setContentView(R.layout.mylayout); 
    /* 以findViewById()取得Button对象，并加入onClickListener */
    Button b2 = (Button) findViewById(R.id.button2);
    b2.setOnClickListener(new Button.OnClickListener()
    { 
      public void onClick(View v)
      { 
        /* new一个Intent对象，并指定要启动的class */ 
        Intent intent = new Intent(); 
        intent.setClass(EX03_09_1.this, EX03_09.class); 
        /* 调用一个新的Activity */ startActivity(intent); 
        /* 关闭原本的Activity */ 
        EX03_09_1.this.finish();
        } 
      });
    }
  }

[hjkto]

<?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="irdc.ex03_09"
      android:versionCode="1"
      android:versionName="1.0.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
      <activity android:name=".EX03_09"
                android:label="@string/app_name">
        <intent-filter>
          <action android:name="android.intent.action.MAIN" />
          <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
      </activity>
      <activity android:name="EX03_09_1"></activity>
    </application>
   <uses-sdk android:minSdkVersion="7" />
  </manifest> 

[Bruce_N]

在manifest.xml增加activity，我也经常忘记

[wo17796452]

看log日志的输出错误

[lxj105627]

在manifest.xml增加activity